diff --git a/.changeset/angry-cars-poke.md b/.changeset/angry-cars-poke.md
new file mode 100644
index 0000000000..d5c50c3e3a
--- /dev/null
+++ b/.changeset/angry-cars-poke.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+**ZKsync:** Fixed `TransactionReceipt` formatter & type.
diff --git a/src/zksync/formatters.ts b/src/zksync/formatters.ts
index aeff174c70..f4857ffc80 100644
--- a/src/zksync/formatters.ts
+++ b/src/zksync/formatters.ts
@@ -81,7 +81,7 @@ export const formatters = {
           return {
             blockNumber: hexToBigInt(l2ToL1Log.blockHash),
             blockHash: l2ToL1Log.blockHash,
-            l1BatchNumber: hexToBigInt(l2ToL1Log.l1BatchNumber),
+            l1BatchNumber: l2ToL1Log.l1BatchNumber ? hexToBigInt(l2ToL1Log.l1BatchNumber) : null,
             transactionIndex: hexToBigInt(l2ToL1Log.transactionIndex),
             shardId: hexToBigInt(l2ToL1Log.shardId),
             isService: l2ToL1Log.isService,
diff --git a/src/zksync/types/log.ts b/src/zksync/types/log.ts
index a8345492af..f22db6721b 100644
--- a/src/zksync/types/log.ts
+++ b/src/zksync/types/log.ts
@@ -45,7 +45,7 @@ export type ZksyncL2ToL1Log = {
 export type ZksyncRpcL2ToL1Log = {
   blockNumber: Hex
   blockHash: Hex
-  l1BatchNumber: Hex
+  l1BatchNumber: Hex | null
   transactionIndex: Hex
   shardId: Hex
   isService: boolean